GENTIANACEAE (GENTIAN FAMILY) 379 



1-3 m. high, glabrous: leaves spatulate-oblong, obtuse or obtusely acuminate, 

 short-petioled, obtusely or obsoletely serrulate, 2-3 cm. long: fertile flowers 

 in sessile fascicles: drupe obtuse, short-oblong or ovoid. Southern Colorado 

 to New Mexico and Texas. 



92. GENTIANACEAE Dumort. GENTIAN FAMILY 



Smooth herbs with bitter, colorless juice. Leaves opposite, rarely alternate 

 or verticillate, without stipules. Flowers perfect, regular. Calyx mostly 

 4-12-lobed or -toothed, often marcescent. Corolla sympetalous, 4-12-lobed 

 or -toothed, convolute or imbricated and usually twisted in the bud, often 

 marcescent. Stamens as many as the lobes of the corolla, alternate with them, 

 inserted on its tube; the 2-celled anthers opening longitudinally. Ovary 

 free, 1-celled, rarely 2-celled, with 2 parietal placentae, or the whole wall ovu- 

 liferous; style single, with usually 2-lobed or 2-lamellate stigma. Capsule 

 dehiscent through the placentae. Seeds indefinitely numerous, rarely few, 

 commonly small. 



Style filiform, deciduous; anthers recurved or twisted in age. 



Corolla-tube exceeding the calyx ....... 1. Erythraea. 



Corolla-tube shorter than the calyx . . . . . .2. Eustoma. 



Style short and persistent or wanting; the stamens remaining 



straight. 

 Corolla without nectariferous pits or large glands. 



Corolla rotate, with the stamens on its base . . . .3. Pleurogyne. 



Corolla not rotate, the stamens on its tube. 



Flowers solitary-terminal; anthers versatile . . . .4. Chondrophylla. 



Flowers cymose; anthers not versatile 5. Gentiana. 



Corolla with 1 or 2 nectariferous pits or scales at the base of each lobe. 



Leaves not verticillate; style wanting 6. Swertia. 



Leaves verticillate; style evident .7. Frasera. 



1. ERYTHRAEA Neck. CENTAURY 



Low and small branching annuals, chiefly with rose-purple or reddish 

 flowers. Calyx 4-5-parted, the divisions slender. Corolla funnslform or 

 salverform, with slender tube and 4-5-parted limb. Anthers exserted, erect, 

 twisting spirally. Style slender, single; stigma capitate or 2-lipped. 



1. Erythraea arizonica (Gray) Rydb. Bull. Torr. Bot. Club 33: 148. 1906. 

 Paniculately or somewhat racemosely branched, 2-3 dm. high: leaves nar- 

 rowly oblong to lanceolate or linear: pedicels as long as or longer than the 

 calyx: corolla-tube longer than the calyx, its lobes obtuse and somewhat 

 shorter than its tube: seeds globular. E. Douglasii. Colorado to U*ah and 

 Arizona. 



2. EUSTOMA Salisb. 



Glaucous, large-flowered annuals or perennials, with more or less clasping and 

 connate leaves, and slender terminal and more or less paniculate 1-flowered 

 peduncles. Calyx 5 (rarely 6)-parted; its lobes long-acuminate, with carinate 

 midrib. Corolla campanulate-funnelform, deeply 5-6-lobed. Anthers oblong, 

 versatile, straight or recurving in age. Stye filiform, nearly persistent; stigma 

 of 2 broad lamellae. 



1. Eustoma Andrewsii A. Nels. Proc. Biol. Soc. Wash. 17: 177. 1904. 

 Perennial from short, vertical, semifleshy roots, with a somewhat enlarged 

 crown or caudex; the old stems occasionally persisting; stems simple below, 

 more or less fasciculately branched above, 2-4 dm. high: leaves elliptic- 

 oblong below to lanceolate and acute above, mostly 3-nerved, 2-4 cm. long; 

 the next year's crown leaves appearing in the autumn as rosettes which are 

 persistent and evergreen: peduncles ebracteate, 3-8 cm. long: calyx deeply 



